粉末冶金プロセスと塑性加工による傾斜機能TiNi形状記憶合金ワイヤの作製（第2報：押出し成形で得られたワイヤの傾斜機能特性）

概要

論文の詳細を見る
The martensitic and the reverse transformation temperatures are directly related to the bending rigidity of the TiNi shape memory alloy (SMA) wire. In this paper, aiming at obtaining a functionally graded TiNi shape memory alloy wire that varies in bending rigidity from high to low along the wire axis, a new fabrication process of combined powder metallurgy and plastic working is proposed. First, a multi-layered TiNi green compact, where Ti-Ni compositions varied layer by layer, was sintered by means of pulse current pressure sintering technique, and then it was hot-extruded into a wire. In this paper, we investigated functionally graded properties of transformation temperatures, texture morphologies and deformation properties of the extruded wires. According to differential scanning calorimetry measurements, it was found that functionally graded properties of transformation temperatures still retain even in the hot-extruded wire. Therefore, the wire having both shape memory effect and superelasticity was successfully fabricated.